Integrity Voice Alarm Routing Matrix
FMIC Manual
Page 2 of 8
DocNo.DCP0002986 ADS 11/12/05 rev0
1ZPR Overview
The 1ZPR has an OK indicator to show that power is connected and there are no local faults. If a fault is
detected with the microphone or 1ZPR the OK light goes out and the FAULT light illuminates.
It also has a speak button which incorporates a Busy indicator/VU level meter.
The audio section features a compressor to cope with varying speech levels, a noise-gate to reduce
background noise, three-band equalization and a selectable chime module (0, 1, 2 or 3 chimes).
In order to page, the microphone’s PTT thumb switch or the 1ZPR’s speak button is pressed and,
provided the system is not busy at a higher priority (shown by the Speak bar flashing solid green), the
speak bar will light solid green and the announcement can be made. The VU meter follows the chime
sound and the operator should not speak until it has finished.
If the system is busy at an equal or higher priority pressing the PTT will have no effect.
FMX Overview
The FMX has a Power indicator that is lit when power is connected and a Fail indicator that lights if the
FMX or 1ZPR detects a fault.
The FMX’s controls and indicators work as follows when connected to a correctly configured Integrity VA
system:
Press the Message 1 “PLAY” button and the associated LED lights briefly. The message (normally
“Evacuate”) plays once and will stop when it reaches the end.
The message 2 controls and indicators are the same except that a “Test” message is normally
controlled.
Technical description
Speech is picked up by the microphone and the signals are passed to a voltage controlled amplifier
under control of a signal derived from rectifying the stage output signals, providing a 3:1 compression
ratio.
The output of this stage is fed to an LED output level display and a three-band equalizer (100 Hz, 1 kHz
and 10 kHz).
The audio line is monitored for faults by means of a 15 V phantom voltage that is injected from the 1LS
card.
Fault Monitoring
The electret microphone capsule is monitored for impedance and current absorption. Any deviation
outside a pre-set window is detected as a fault which turns off the OK LED and lights the Fault LED. At
the same time, the monitor circuit disconnects a 6k8 end of line resistor in the PTT circuit, causing the
PTT line voltage to rise. This is detected as a fault by the 1LS card.
Cables
The FMIC is designed to use two four-core fire-rated cables that enter the case via two 20 mm knock-
outs in the top or bottom of the case. In non life-safety applications, Cat 5 cable can be used instead. Up
to four FMICs can be daisy-chained on up to 1000 metres if cable (fire rated or Cat 5).
